The M3 Lagan Bridge in Belfast will be closed this weekend while Transport NI completes its final weekend of essential maintenance works.
It will be closed westbound from the Sydenham direction from 11pm tonight until 6am on Monday.
The diversion route will include Bridge End, Dalton Street Link, Middlepath Street on-slip, M3 Nelson Street off-slip, Great George Street and York Street.
A TransportNI spokesman said: "This weekend is expected to see the completion of a major maintenance scheme on the M3 Lagan Bridge, Belfast.
"The works are necessary to ensure the safety of the road network and have involved the replacement of bridge expansion joints and resurfacing.
"TransportNI has made every effort to programme the necessary works operations and traffic management arrangements to minimise inconvenience.
"TransportNI would like to remind the public about work taking place this weekend."